Sabaton will headline the Przystanek Woodstock festival in Poland which will take place on 2nd to 4th August. Also appearing on the bill are Machine Head, Anti-Flag, Ministry, Asian Dub Foundation, The Qemists, Hardcore Superstar, Elektryczne Gitary, Zielone Żabki, Dubioza Kolektiv, My Riot, Carrantuohill, Omkara and Piotr Bukartyk with probably more to be announced.

The band made the following statement: "We are really happy to announce that we are the main headliner of the Przystanek Woodstock festival in Poland. This is the biggest festival in Europé and our concert will be one of the biggest Metal concerts ever made on this planet. This will be a night to remember for sure."

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Sabaton revealed the artwork and tracklising for their forthcoming album 'Carolus Rex' last month. The album will be released on 25 May through Nuclear Blast Records.

The lyrics of the album are about the Swedish Empire (the Kingdom of Sweden between 1561 - 1721) and are sung entirely in Swedish.

The band commented: "For the first time ever we have had an expert to help us out with the theme, the well-known Swedish historian Bengt Liljegren. We have also added some extra time in the studio to find the absolute sound right on 'Carolus Rex' and our producer, Peter Tägtgren, says that this album will mark a brand new standard for how a Heavy Metal album should sound like!"

At Liljegrens works include acclaimed biographies of others Charles XII. He was also part of the popular Swedish TV series 'Boston Tea Party.'